The e-grip is the best thing to buy if you wanna make your tippy into a full auto monster. I had the RT trigger before I bought the e-grip, and there is no comparison. The e-grip was easy to install, and right outta the packaging I was loving this thing. The battery is easy to replace once you have done it once. My only real complaint would have to be that you need to carry a jewlers screwdriver to be able to switch firing mods and ROF. It might be a good idea to also by a decent double trigger for the egrip. Those are easy to install as well. A good JCS double trigger or something like it will insure you can play speedball as well as woodsball. Some refs even think I'm cheating sometimes when I double tap.... But thats another story. The battery lasts for 3-4 cases of paint. After you have played a few times, it might be a good idea to carry an extra 9-volt. The sear comment above may just be for me, I have gone through 2 in the past 6 months, might just be somethin wrong with mine, but just thought I'd mention it.

Conclusion:

This is the best alternative to the RT out on the marker. The only negatives are that it eats batteries pretty quick if you play alot, you need tiny screw drivers to change the ROF and mods, and it could potential make you buy new sears. Overall however It is a great investment, especially with a double trigger.